Generate leaner rule code

The generator leaves out token checks the surrounding code already
guarantees, and builds children with array_slice() now that no reducer
pushes a list onto the value stack.

Amp-Thread-ID: https://ampcode.com/threads/T-01a17820-94d1-75c8-9206-2e802d9c0556

Author: ondrejmirtes

src/Parser/AstBuilder.php

@@ -1057,14 +1057,10 @@ protected function reduceObjectShapeKey(int $begin, int $end, $children): Node
 	/**
 	 * A comment read right after the comma separating the items of a shape is
 	 * thrown away.
-	 *
-	 * @return list<mixed>
 	 */
-	protected function reduceDiscardedComment(int $begin, int $end): array
+	protected function reduceDiscardedComment(int $begin, int $end): void
 	{
 		unset($this->comments[$begin]);
-
-		return [];
 	}
 
 	// -------------------------------------------------------------------------